+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   30785 Greeley (1988 PX) Classification: Mars-crossing Asteroid          SPK-ID: 2030785 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO253568 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.3451017 n/a   a 2.2000317 n/a AU q 1.4407970 n/a AU i 5.40294 n/a deg node 13.42744 n/a deg peri 308.88763 n/a deg M 201.11124 n/a deg tp 2456926.5566267 (2014-Sep-26.05662670) n/a JED period 1191.9054917 3.26 n/a n/a d yr n 0.30203737 n/a deg/d Q 2.9592664 n/a AU   Orbit Determination Parameters    # obs. used (total)      171      first obs. used      1988-??-??      last obs. used      2013-02-17      # oppositions      9      planetary ephem.      DE403      condition code      1      fit RMS      0.53      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.580  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.3 mag n/a PDS3 (MPO 18538)   30785 Greeley           Discovered 1988 Aug. 13 by C. S. Shoemaker and E. M. Shoemaker at Palomar. Ronald Greeley (b. 1939) has been involved in lunar and planetary studies since 1967. His current research focuses on understanding planetary surface processes and geological histories and involves a combination of spacecraft data analysis, laboratory experiments and geological field studies on the earth. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20030501/MPCPages.arc Last Updated: 2003-10-02 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-20 16:41 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin